Add time:07/16/2019         Source:sciencedirect.com

The influence of alloyed yttrium (0.15–0.3 wt.%) on the fireside corrosion behaviour of Ni-Fe based alloy was investigated at 750 °C. Results show that external scales of Cr2O3 and Al oxide, as well as internal Ti sulphide form during the corrosion regardless of the chemical composition of alloys. However, the scale thickness and corrosion rate are reduced by the alloyed-yttrium, e.g. the mass gain of 0.3 wt.% yttrium-contained alloy after 50 h corrosion is ∼60% the value of the yttrium-free alloy. The yttrium doping in Cr sulphide particles in oxide scales most likely accounts for such a positive effect.

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